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Low drop-out voltage regulator

a voltage regulator and low dropout technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve problems such as imposing stability problems, and achieve the effect of stable transient behavior and stable outpu

Active Publication Date: 2015-02-05
EM MICROELECTRONIC-MARIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an improved voltage regulator that can compensate for a zero frequency with respect to a variable load at the output of the regulator. The regulator should provide a stable output for a varying load, as well as for varying external conditions such as temperature variations. Additionally, the regulator should exhibit a stable transient behavior in response to load modifications.

Problems solved by technology

The fundamental design challenge in an LDO is to stabilize it over a zero load current (no load) to a maximum load current (full load) that is required for a particular application.
Crucial drawbacks of prior art solutions arise from the fact that the LDO stability critically depends on the value of the equivalent resistance, which does not only depend on the manufacturer of the capacitor but also varies with an operating frequency and temperature.
The equivalent resistance of such LDO regulators therefore imposes a stability problem.

Method used

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Embodiment Construction

[0038]The voltage regulator 1 as it is schematically illustrated in FIG. 1 comprises a regulation loop 2 featuring a pass transistor 18, a sensing transistor 22, a retention transistor 24 as well as a source transistor 28. The source transistor 28 together with a further transistor 32 sets up a current mirror 3. Hence, the source of the source transistor 28 and the source of the transistor 32 are connected to an input port 21, where an input voltage VDD is supplied. The transistor's 32 and the source transistor's 28 gates are mutually connected. A node 31 between the gates of the source transistor 28 and transistor 32 is connected with a drain of transistor 32. This particular node 31 is further connected with the gate of a first MOS resistor 12 as will be further explained below. The drain of the transistor 32 is connected with a first current source 38 connected to ground.

[0039]Moreover, the drain of the source transistor 28 is connected with a node 25, which is in series with the...

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Abstract

The voltage regulator comprises a regulation loop (2), which comprises at least a pass transistor (18), a source transistor (28), a sensing transistor (22) and a retention transistor (24), and a stability compensation circuit (10), which comprises a first MOS resistor (12) and a second MOS resistor (14) coupled with the first MOS resistor (12). The gate of the second MOS resistor (14) is coupled to the gate of the pass transistor (18).

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of voltage regulators and in particular to low dropout (LDO) regulators.BACKGROUND AND PRIOR ART[0002]A low dropout or LDO regulator is a DC linear voltage regulator which can operate with a comparatively small input-output differential voltage. In general, such regulators feature a comparatively low dropout voltage and a comparatively low minimum operating voltage, further having a high efficiency operation and comparatively low heat dissipation. Typically, such regulators comprise at least one field effect transistor (FET) which is typically implemented by a metal oxide semiconductor component.[0003]Low dropout regulators are of particular interest when it comes to efficient power management in battery operated portable consumer products. The fundamental design challenge in an LDO is to stabilize it over a zero load current (no load) to a maximum load current (full load) that is required for a particular applic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G05F1/595
CPCG05F1/595G05F1/56
Inventor BUESCHER, KEVINBURYANEC, JIRI
Owner EM MICROELECTRONIC-MARIN